Transcript for Trump administration to roll out plan for longer-term detention of migrant families

The White House is expected to announce a new plan today when it comes to detaining migrant families at the border under current rules. Flagrant dailies with children can be held in no longer than twenty days. White House is expected to announce a plan to make that time period longer any new policy is likely to be challenged in court. The president has blamed the twenty day limit for encouraging migrants to travel with children so they can be re released earlier. There are new clues in the search for a killer on a college campus in Southern California police say this video shows the man who fatally stabbed a retired administrator. This is a cal state Fullerton but suspect. Was running from the parking lot where the victim was found. Police say the suspect drove away in a BMW and was likely injured during the attack.

This transcript has been automatically generated and may not be 100% accurate.

Now Playing: Joe Biden takes on rivals, ‘Medicare for All’ during Democratic debate

Now Playing: Analysis, insight and highlights of the 3rd Democratic primary debate

Now Playing: Texas Southern University students break down important debate night moments

Now Playing: Biggest winners and losers of Democratic debate

Now Playing: Kim Kardashian West not worried about ‘reputation’ while working with Trump

Now Playing: O'Rourke takes a stand against gun violence after Texas shootings

Now Playing: ABC News talks about Trump’s take on Democrats

Now Playing: Buttigieg on being in the military under 'Don't Ask, Don't Tell'

Now Playing: Warren credits campaign's success to meeting voters

Now Playing: Klobuchar takes on Sanders during debate

Now Playing: Harris defends work as prosecutor after she’s questioned during debate

Now Playing: Analyzing Kamala Harris' debate performance

Now Playing: {{itm.title}}

{"duration":"0:43","description":"The Trump administration is expected to announce new rules that would allow for the longer term detention of families traveling with children across the border.","mediaType":"default","section":"ABCNews/Politics","id":"65092900","title":"Trump administration to roll out plan for longer-term detention of migrant families","url":"/Politics/video/trump-administration-roll-plan-longer-term-detention-migrant-65092900"}